add config option for unsupported-URL file

for consistency's sake

docs/configuration.rst

@@ -99,6 +99,15 @@ Description File to write logging output to.
 =========== =====
 
 
+output.unsupportedfile
+----------------------
+=========== =====
+Type        ``string``
+Default     ``null``
+Description File to write external URLs unsupported by *gallery-dl* to.
+=========== =====
+
+
 Downloader Options
 ==================
 

docs/gallery-dl.conf

@@ -129,5 +129,6 @@
         "shorten": true,
         "progress": true,
         "logfile": null,
+        "unsupportedfile": null
     }
 }

gallery_dl/__init__.py

@@ -104,7 +104,7 @@ def main():
                 path = util.expand_path(logfile)
                 handler = logging.FileHandler(path, "w")
             except OSError as exc:
-                log.warning("logfile: %s", exc)
+                log.warning("log file: %s", exc)
             else:
                 handler.setFormatter(formatter)
                 logging.getLogger().addHandler(handler)
@@ -165,11 +165,12 @@ def main():
                     urls += sanatize_input(file)
                     file.close()
                 except OSError as exc:
-                    log.warning("input-file: %s", exc)
+                    log.warning("input file: %s", exc)
 
-            if args.unsupportedfile:
+            unsupportedfile = config.interpolate(("output", "unsupportedfile"))
+            if unsupportedfile:
                 try:
-                    path = util.expand_path(args.unsupportedfile)
+                    path = util.expand_path(unsupportedfile)
                     job.Job.ufile = open(path, "w")
                 except OSError as exc:
                     log.warning("unsupported-URL file: %s", exc)

gallery_dl/option.py

@@ -129,7 +129,7 @@ def build_parser():
     )
     output.add_argument(
         "--write-unsupported",
-        metavar="FILE", dest="unsupportedfile",
+        metavar="FILE", dest="unsupportedfile", action=ConfigAction,
         help=("Write URLs, which get emitted by other extractors but cannot "
               "be handled, to FILE"),
     )